Watch 3 world cup videos taken in the last 3 years (watch videos from prior also!) From my analysis there is a pole plant and more precisely it happens on the corridor line.
At the very least there is pole usage. This year the US ski team can out with a pyramid of fundamental SL skills. "pole usage" is the term they will use. Maybe it is because of Makayla who uses more of a tap than a plant.
http://www.youcanski.com/en/coaching/pole_plant.htm - "I believe it is hardly a secret that pole plants have been used by ski racers for a very long time in slalom and GS. However, while conducting coaching seminars in US and Canada, I have discovered a number of misconceptions about the use of the pole plant in modern technique. Many coaches and ski instructors believe that for making carved turns on modern slalom skis the pole plant is not needed. Some go even further to say that the racers do not even use the pole plants any longer. Others are still of the opinion that the pole plant is still used primarily for turning the skis. In this article I will try to highlight the incorrect nature of these erroneous assumptions." read more by Greg Gurshman.
Ron LeMaster pages 26 - 36 / Page 48 and 49